Analysis of the interspecific association between Culex pipiens and Cx. perexiguus mosquito larvae (Diptera: Culicidae) in two urban environments of Cairo, Egypt.

Mosquito surveys of two urban localities in Cairo (El-Muqattam and Abu-Seir) were undertaken for one year. The extent of interspecific association between the two common species: Culex pipiens and Cx. perexiguus was measured on the basis of presence-absence data and on their relative numbers. The two species had a significantly slight/ moderate association (C= 0.19-0.35 and CABA= 0.50-0.54, P?0.001). The values of Sorensen's coefficient (I) indicated high association in El-Muqattam (0.88) and moderate association in Abu-Seir (0.47) or the two localities altogether (0.53). Such coefficient showed monthly variation and was directly related to the separate/ compiled densities of the two species (b= 0.01-0.02) in El-Muqattam (P?0.05), Abu-Seir and the two localities (P?0.05). The obtained results indicate that the requirements of the two species are similar and that their larval densities influencing the degrees of their interspecific association. [ABSTRACT FROM AUTHOR]

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